<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>行内样式</title>
</head>
<body>
    <div style="width: 300px;height: 300px;background-color: #f0f0f0;">我是一个div标签</div>
    <div>我也是一个div标签</div>
</body>
</html>